Good night, night: Light pollution increasing around globe

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Good night, night: Light pollution increasing around globe

This photo combo of images provided by NASA’s Earth Observatory/Kyba, GFZ shows photographs of Calgary, Alberta, Canada, taken from the International Space Station on Dec. 23, 2010, left, where residential areas are mainly lit by orange sodium lamps; and on Nov. 27, 2015, right, where many areas on the outskirts are newly lit compared to 2010, and many neighborhoods have switched from orange sodium lamps to white LED lamps.

Good night, night: Light pollution increasing around globe

This photo combo of images provided by NASA’s Earth Observatory/Kyba, GFZ shows photographs of Calgary, Alberta, Canada, taken from the International Space Station on Dec. 23, 2010, left, where residential areas are mainly lit by orange sodium lamps; and on Nov. 27, 2015, right, where many areas on the outskirts are newly lit compared to 2010, and many neighborhoods have switched from orange sodium lamps to white LED lamps.